L6713A STMicroelectronics, L6713A Datasheet - Page 56

• Manufacturer Part Number: L6713A
• Description: IC CTRLR 2/3PH W/DRIVERS 64-TQFP
• Manufacturer: STMicroelectronics

Specifications of L6713A

• Applications: Controller, Intel VR10, VR11, AMD CPU
• Voltage - Input: 12V
• Number Of Outputs: 3
• Voltage - Output: 0.3 ~ 1.6 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 64-TQFP Exposed Pad, 64-eTQFP, 64-HTQFP, 64-VQFP
• Output Current: 2 A
• Mounting Style: SMD/SMT
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: 0 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Tolerance band (TOB) definition
23.2
23.3
56/64
Ext. current sense circuit tolerance (TOB
It can be further sliced as follow:
●
●
●
●
All these parameters impacts the AVP, so they must be weighted on the maximum voltage
swing from zero load up to the maximum electrical current (V
current sense circuit results:
Time constant matching error tolerance (TOB
●
●
All these parameters impact the dynamic AVP, so they must be weighted on the maximum
dynamic voltage swing (I
Inductor DCR Tolerance (k
voltage since the device reads a current that is different from the real current flowing
into the sense element. As a results, the controller will source a I
from the nominal. The results will be an AVP different from the nominal in the same
percentage as the DCR is different from the nominal. Since all the sense elements
results to be in parallel, the error related to the inductor DCR has to be divided by the
number of phases (N).
Trans-conductance resistors tolerance (k
the current reading circuit gain and so impacts on the output voltage. The results will be
an AVP different from the nominal in the same percentage as the Rg is different from
the nominal. Since all the sense elements results to be in parallel, and so the three
current reading circuits, the error related to the Rg resistors has to be divided by the
number of phases (N).
NTC initial accuracy (k
used for the thermal compensation impacts on the AVP in the same percentage as
before. In addition, the benefit of the division by the number of phases N cannot be
applied in this case.
NTC temperature accuracy (k
the output voltage positioning. The impact is bigger as big is the temperature variation
from room to hot (ΔT).
Inductance and capacitance tolerance (k
in the value of the capacitor used for the time constant matching causes over/under
shoots after a load transient appliance. This impacts the output voltage and then the
TOB. Since all the sense elements results to be in parallel, the error related to the time
constant mismatch has to be divided by the number of phases (N).
Capacitance temperature variations (k
matching also vary with temperature (ΔT
ad before. Since all the sense elements results to be in parallel, the error related to the
time constant mismatch has to be divided by the number of phases (N).
TOB
CurrSense
TOB
dyn
TCMatching
NTC_0
). Total error due to time constant mismatch results:
=
DCR
). Variations in the NTC nominal value at room temperature
V
NTC
2
AVP
). Variations in the inductor DCR impacts on the output
=
). NTC variations from room to hot also impacts on
⋅
k
------------- -
V
2
DCR
2
AVPDyn
N
Ct
). The capacitor used for time constant
C
L
Rg
+
, k
) impacting on the output voltage transients
k
-------- -
). Variations in the Rg resistors impacts in
N
2
Rg
C
⋅
k
--------------------------------------------------------- -
). Variations in the inductance value and
2
L
+
+
k
2
NTC0
k
2
C
+
(
+
N
k
Ct
⎛
⎝
AVP
CurrSense
α ΔT k
--------------------------------- -
⋅
⋅
ΔTC
). Total error from external
DCR
⋅
)
TCMatching
DROOP
2
NTC
⎞
⎠
)
2
current different
)
L6713A